This document discusses the new features of Java 9, including the Java Platform Modular System and Process API updates. The Java Platform Modular System (JPMS) introduced modularity to Java, allowing code to be organized into modules that have explicit dependencies. This resolved issues like class definition errors and security problems. The Process API was updated with new methods to get process information and handle processes like getting the process ID and creating new processes using ProcessBuilder. The presenter provides an overview of JPMS modules and structure, compares Java 1.8 to 1.9, and demonstrates the updated Process API.

1. Java 9 :
Features
Presented By: Jasmine Kaur
Software Consultant
Knoldus Inc. (Singapore)
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2. About Knoldus
Knoldus is a technology consulting firm with focus on modernizing the digital systems
at the pace your business demands.
DevOps
Functional. Reactive. Cloud Native

3. 01 Java 9 and its features
02 Java Platform Modular System
03 Process API Updates
Our Agenda
02
2.1
2.2
Comparison between Java 1.8 and 1.9
Module Structure

4. New features which came in Java 9

5. JAVA PLATFORM MODULAR
SYSTEM

6. Modularity : JPMS (Java Platform Modular System)
Comparison between Java 1.8 and Java 1.9
● NoClassDefFoundError
● Version Conflict
● Security Issues
● Bigger size

7. Module Structure
Modularity : JPMS ( Java Platform Modular System)

8. Modularity : JPMS (Java Platform Modular System)
What If ???

9. PROCESS API UPDATES

10. Process API Updates
● Process id of current running process
● Create a new process (Example : open a notepad, compile a java program)
● Destroy already running process (Example : Close a notepad, stop a java
program)
● Get complete information of a process
● Get child process information
● Get parent process information

11. What’s new in Java 9 Process API ?
● Process class : Several new methods were added like pid(), info() etc
● ProcessBuilder : Use to create our own operating system process
● ProcessHandle interface : Use to handle the processes like access current
running process, access the parent/child of a particular process
● ProcessHandle.Info : Inner interface inside Process Handle interface. It is used
to provide the complete information of a current running process.
Note: All these classes and interfaces are present inside java.lang package, so we are not
required to use any import statements.
Process API Updates

12. How to get ProcessHandle Object ?
1. ProcessHandle handle = ProcessHandle.current();
2. ProcessHandle handle = process.toHandle();
// where process is the Process object
3. Optional<ProcessHandle> handle = ProcessHandle.of(PID);
Process API Updates

13. ProcessHandle.Info
Info interface provides information snapshot about :
● Single process
● All processes
Process API Updates

14. ProcessBuilder
This class is used to make the operating system processes.
ProcessBuilder processBuilder = new ProcessBuilder(String... command);
Process process = processBuilder.start();
Note : The argument should be a valid command to invoke the process.
Process API Updates

15. Creation and destroying a process
● Create and destroy process from java using ProcessBuilder.
● Destroy a project which is not created from java.
Process API Updates

16. DEMO

17. 01
References
https://www.youtube.com/watch?v=K8Jc_EaBVMI
https://www.youtube.com/watch?v=0RegttLUXeU
https://blog.knoldus.com/
https://www.youtube.com/watch?v=Yacu1yUktjY
https://www.youtube.com/watch?
v=K8Jc_EaBVMI&list=PLd3UqWTnYXOlcXp3bEgxelRegCgnAvcNe
https://docs.oracle.com/javase/9/

18. Thank You!
Jasmine.kaur@knoldus.com